Zobrazeno 1 - 10
of 168
pro vyhledávání: '"Fatollahi, A. H."'
Publikováno v:
International Journal of Modern Physics A, Vol. 37, No. 24, 2250142 (2022)
A photon source is located in a rotating waveguide. An absorber with a sharp absorbing frequency absorbs some of the emitted photons. This decreases the number of photons which are detected by a detector. The frequency (energy) spectrum measured in t
Externí odkaz:
http://arxiv.org/abs/2211.13011
Autor:
Kianfar, Afsaneh, Fatollahi, Amir H.
Publikováno v:
Physical Review D 106, 074504 (2022)
The transfer-matrix of the U(1) lattice model is considered in the Fourier basis and in the weak coupling limit. The issues of Gauss law constraint and gauge invariant states are addressed in the Fourier basis. In particular, it is shown that in the
Externí odkaz:
http://arxiv.org/abs/2206.06297
Autor:
Kianfar, Afsaneh, Fatollahi, Amir H.
Publikováno v:
Phys. Rev. D 104 (2021) 094506
The transfer-matrix of U(1) lattice gauge theory is investigated in the field Fourier space, the basis of which consists of the quantized currents on lattice links. Based on a lattice version of the current conservation, the transfer-matrix elements
Externí odkaz:
http://arxiv.org/abs/2107.07877
Publikováno v:
Roy. Soc. Open Sci., vol. 7 (2020) 201534
Exact mathematical identities are presented between the relevant parameters of droplets displaying circular contact boundary based on flat tilted surfaces. Two of the identities are derived from the force balance, and one from the torque balance. The
Externí odkaz:
http://arxiv.org/abs/2010.14143
Autor:
Fatollahi, Amir H.
Publikováno v:
Europhysics Letters, 128 (2019) 27002
A gas-liquid type of phase transition is found based on the particle dynamics on radius-$R$ circle in which the coordinate appears as the angle-variable of 1D XY-model. Due to the specific appearance of compact-space radius (volume) in the present in
Externí odkaz:
http://arxiv.org/abs/1811.02408
Autor:
Vadood, Narges, Fatollahi, Amir H.
Publikováno v:
Commun. Theor. Phys. 71 (2019) 921
The properties of the transfer-matrix of U(1) lattice gauge theory in the Fourier basis are explored. Among other statements it is shown: 1) the transfer-matrix is block-diagonal, 2) all consisting vectors of a block are known based on an arbitrary b
Externí odkaz:
http://arxiv.org/abs/1807.03150
Autor:
Vadood, Narges, Fatollahi, Amir H.
The consequences of the gauge-coupling dependent normalization-factor of $1/g^{\alpha}$ in the transfer-matrix of 2d U(1) lattice gauge theory are explored. It is seen by the $\alpha=1$ choice that the lowest energy develops a minimum at coupling $g_
Externí odkaz:
http://arxiv.org/abs/1803.05497
Autor:
Barghi-Janyar, N., Fatollahi, A. H.
The dynamics of an electric charge $e$ in presence of a fixed monopole pair $\pm g$ is considered. Depending on the ratio of the angular momentum to $e\,g/c$, the effective potential may consist a minimum valley between the poles or a finite depth we
Externí odkaz:
http://arxiv.org/abs/1801.10001
Autor:
Fatollahi, Amir H.
The site-reduction of U(1) lattice gauge theory along the spatial directions is used to model the monopole dynamics. The reduced theory is that of the angle-valued coordinates on the discrete worldline. Below the critical coupling $g_{c}=1.125$ and t
Externí odkaz:
http://arxiv.org/abs/1705.08732
Autor:
Fatollahi, Amir H.
Publikováno v:
Eur. Phys. J. C, 77 3 (2017) 159
The general theoretical ground for the models based on the compact angle coordinates is presented. It is observed that the proper dependence on compact coordinates has to be through the group elements and is achieved most naturally in a discrete-time
Externí odkaz:
http://arxiv.org/abs/1611.08009